Boat.



Patented Dec. 3|, l90l.

L A B E H T 0 M B W BOAT.

(Applicatiun filed May 2, 1900.)

(No Model.)

0.. wAsNmcwN 0 c WILLIAM B. MOTHERAL, OF NORTH MCGREGOR, IOWA, ASSIGNOR OF TWO- THIRDS TO CHARLES Z. POTE, OF WASHINGTON, DISTRICT OF COLUMBIA, AND JOHN S. RODGERS, OF OHARLEROI, PENNSYLVANIA.

BOAT.

srncrrioacrron forming part of Letters Patent Ne. 690,029, dated December 31,1901.

Application filed May 2,1900. Serial No. 15.230. (No model.)

To a tuhmn it may 007t0e7'it;

Be it known that I, WILLIAM B. MorHEaAL, a citizen of the United States, residing at North McGregor, in the county of Clayton and State of Iowa, have invented certain new and useful Improvements in Boats, of which the following is a specification.

My said invention consists in an improved form of hull, particularly the bottoms of boats, whereby greater speed may be attained with less power than by the usual forms, all as will be hereinafter more particularly described and claimed.

Referring to the accompanying drawings, which are made a part hereof and on which similar reference characters indicate similar parts, Figure 1 is an under side plan view of a boat embodying my said invention; Fig. 2, a central longitudinal section through the same; Fig. 3, a transverse section on the dotted lines 3 3, and Fig. 4 a similar viewon the dotted lines at at in Fig. 1.

In said drawings the portions marked A represent the sides, and B the bottom, of the hull. The hull is wedge-shaped and in most particulars of the general construction shown in my Patent No. 646,859 consisting of the sides A and a double bottom B B, with suitable supporting-francework between them, dividing said bottom into air-chambers, the lower bottom B being perforated, and an air-supplying apparatus P being provided for forcing air through said perforations to form a sheet of air between the bottom of the boat and the water, and thus reduce the frictional resistance of the water. In these particulars and also in the wedge shape of the hull in horizontal section the invention follows that fully described in my above-mentioned former patent. I have found by experiment that the resistance due to the displacement of the water can be further overcome by a peculiar shape of the bottom of the boat, as follows: I form the central portion 1 of the bottom B fiat and make this portion substantially onehalf the width of the bottom, increasing from near the pointed bow as the width of the bottom increases to a point a short distance from the stern, as 3, where the flat portion extends entirely across the bottom. On each side of said fiat portion 1 I form a portion 2 of about half the width of portion 1, which extends to the edge of the bottom at a slight upward angle therewith. Said inclined portions 2 also increase in width from the bow toward the stern proportionately as the width of the bottom increases, and from a point a short distance in front of point 3, as at 4, they gradually flatten in angle until at point 3 they merge into the fiat portion 1, which, as above stated, extends entirely across the boat from this point to the stern. Behind said point 3 said bottom is formed with a down ward swell 5, convex in form and extending entirely across the bottom, its surface being straight transversely of the boat.

As before stated, the object of this invention is to enable a high speed to be attained with small power, and I have found by experiment that this form of bottom, combined with the peculiar shape of hull, and the use of air between the bottom and the water is of great value and assistance in securing this result. By reason of the wedge shape of the hull the stern has a tendency to rise as the speed of the boat increases, and thus reduces the displacement, and consequently the frictional resistance, of the water. The inclined portions 2 on each side of the fiat portion 1 of the bottom serve to assist this rising tendency, and the gradual flattening of their angle from the point 4, terminating at 3 in a flat bottom for its entire width, with the curved-down portion at at the stern, still further aids in lifting said stern, until when under high speed the boat has but slight displacement and practically slides over the surface of the water instead of cutting through it, and thus meets but little frictional resistance therefrom, thereby enabling little power to drive the boat with great speed. The twist in the angles of parts 2 from point 4: to point 3 gives them a wing formation, which is of great assistance in raising the stern, as will be readily understood.

Having thus fully described my said invention, What I claim as new, and desire to secure by Letters Patent, is-

forth.

2. A boat having a bottom With a narrow bow and Wide stern, formed with a central fiat portion increasing in Width from bow to- Ward the stern, and inclined portions of varying pitch on each side of said fiat portion also increasing in Width from bow toward the stern, substantially as set forth.

3. A boat formed with a narrow bow and a wide stern, and of regular increasing width from how toward the stern, and having a bottom flat in its center and inclined on each side, the angle of the inclined portions gradually fiattening from an intermediate point toward the stern until they merge into the flat portion, substantially as set forth.

4. A boat with a bottom having a flat central portion and an inclined portion on each side, the incline gradually decreasing from an intermediate point until it merges into the flat portion near the stern, substantially as set forth.

5. A wedge-shaped boat having a bottom with a flat portion in its center, an inclined portion on each side, and a downwardly curved portion across its stern, substantially as set forth.

6. A boat with a bottom formed witha fiat central portion, an inclined portion on each side thereof, and a downwardly-curved portion across its stern, substantially as set forth.

7. A boat formed with a Wedge-shaped hull having a bottom with a flat middle portion,

a portion extending upwardly at an angle' WILLIAM B. DIOTII'ERAL. [L 8.]

Witnesses:

E. W. BRADFORD, FORSBERG BROWN. 

